I have used my SDRIQ with my MS Surface in the car. The SDRIQ is a nice
compact box 4.5 in X 4 in X 1 in (W X D X H) powered by the USB port. I use
Spectravue software and a National RF, Inc HFDF handheld loop.
Mike
K7PI
-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of Frank N. Haas
KB4T
Sent: Monday, December 12, 2016 10:26
To: Don Kirk <wd8dsb@gmail.com>
Cc: rfi@contesting.com
Subject: Re: [RFI] Using an SDR to locate RFI
Exactly!
On Dec 12, 2016 1:24 PM, "Don Kirk" <wd8dsb@gmail.com> wrote:
> Hi Frank,
>
> You and I think exactly alike regarding not being interested in what
> the source is when trying to track it down, but rather locating the
> source first (what property it's emanating from), and then figuring
> out what the source is.
>
> I just read your other posting, and I think what you are saying is
> that you want an SDR setup that's convenient for mobile use. I don't
> think you're saying the SDR technology does not display what you want,
> but rather the hardware is cumbersome from a mobile setup? Is this
correct?
>
> Don
>
> On Mon, Dec 12, 2016 at 1:14 PM, Frank N. Haas KB4T <
> utility.rfi.pro@gmail.com> wrote:
>
>> Don:
>>
>> Most Power Line arcing as well as most other interference sources
>> produce a consistent, non-sinusoidal or barely varying signal
>> strength indication on the IC-7000. Clearly the hysteresis of the AGC
>> circuits average the signal strength indication well. Yet the signal
>> strength indication effectively rises and falls nicely in step with
>> my approach and departure as I pass a true RFI source.
>>
>> The 7000 does not have a true spectrum scope like the 756Pro receivers.
>> There is a spectrum scan feature but it is essentially useless for
>> RFI location...in my opinion. I'm no so concerned with the frequency
>> of the interference source's components. Instead I'm concerned with
>> the frequencies affected by the source. There is a difference. I
>> focus on locating the source, not what the source is composed of.
>>
>> 73,
>>
>> Frank N. Haas KB4T
>> Utility Interference Investigator
>> Florida
>>
>> On Mon, Dec 12, 2016 at 12:46 PM, Don Kirk <wd8dsb@gmail.com> wrote:
>>
>>> Rank,
>>>
>>> Another comment. It looks like the peaks are approximately every
>>> 4000 hertz in your display which would make it look more like noise
>>> from a variable speed drive or similar source, and not arcing on a
>>> power line. If that's the case, then my SDR receiver as well as
>>> analog HF rig definitely see the peaks and valleys of such interference.
>>>
>>> Don (wd8dsb)
>>>
>>> On Mon, Dec 12, 2016 at 12:38 PM, Don Kirk <wd8dsb@gmail.com> wrote:
>>>
>>>> HI Frank,
>>>>
>>>> One has to ask if the display you see on the IC-7000 is real? As
>>>> an example, if it were real then as you tune the frequency up and
>>>> down the band on the IC-7000 you should see peaks and valleys in
>>>> the S meter reading, but that's not what I typically see when
>>>> observing power line arcing (or light dimmer interference which
>>>> mimics power line arcing quite well as it provides a transient
>>>> during both the positive and negative portion of the sine wave). I
>>>> typically just see a rise in the overall noise floor regardless of
>>>> what frequency I'm on within a band both on my old Kenwood TS-180s
>>>> analog HF rig, or on an SDR receiver (but next time I experience
>>>> powerline noise I will be more observant, and I will simulate that
tonight with a light dimmer I have at home).
>>>>
>>>> All of my experience is down on 160 meters, but suspect what I see
>>>> down there would be similar on other bands????
>>>>
>>>> Maybe if you see peaks and valleys as you tune across the band we
>>>> could theorize that more energy is effectively radiated by the
>>>> power lines on frequencies where they are resonant, but I don't
>>>> think that's the case based on how often the peaks and valleys are
occurring on your display.
>>>>
>>>> What do you think about my above comments?
>>>>
>>>> P.S. you raise an interesting issue/topic that I will pay more
>>>> attention to the next time I encounter power line arcing.
>>>>
>>>> Don (wd8dsb)
>>>>
>>>> On Mon, Dec 12, 2016 at 11:19 AM, Frank N. Haas KB4T <
>>>> utility.rfi.pro@gmail.com> wrote:
>>>>
>>>>> For the last several months, I've been trying to use an SDRPlay
>>>>> SDR Receiver with 3 different software packages as a tool for
>>>>> locating arcing and other forms of interference to the HF and VHF
>>>>> spectrum. I have virtually nothing to show for the effort.
>>>>>
>>>>> For over a decade, I've been using an ICOM IC-7000 mounted in my
>>>>> work vehicle with a Hi-Q 4/80 HF screwdriver antenna, a VHF 3 dB
>>>>> base loaded mobile antenna, a 5 dB center loaded UHF mobile
>>>>> antenna and an antenna switch to effectively drive to within 1
>>>>> pole or 1 structure of the source.
>>>>> The system has served me well and made my (nearly daily)
>>>>> interference location work efficient and easy.
>>>>>
>>>>> The IC-7000 is long in the tooth. While I enjoy cashing the Social
>>>>> Security checks for the rig, I admit I'm spoiled by the enormously
>>>>> informative spectral displays provided by SDRs. It's time to
>>>>> retire the 7000 and install something new. The SDRs seem like the
>>>>> perfect, reasonably priced solution. Yet the SDRs are so efficient
>>>>> at masking noise that it's nearly impossible to use one as a
>>>>> locating tool.
>>>>>
>>>>> But my experience is limited to the SDRPlay. I chose the SDRPlay
>>>>> because of its frequency coverage. I've tried SDRUno, SDR Sharp
>>>>> and HDSDR software packages. I've spent hours experimenting with
>>>>> the configuration of each of these software options and have not
>>>>> been able to find a setup that effectively, consistently and
>>>>> clearly displays arcing interference.
>>>>> What
>>>>> I'm looking for is the type of display one sees on an ICOM
>>>>> IC-756-II or -III spectrum display. Look me up on QRZ (KB4T) to
>>>>> see a picture of what I seek.
>>>>>
>>>>> I've tried an Anritsu and an HP Spectrum Analyzer and they lack
>>>>> the sensitivity or the mounting practicality to do what I want.
>>>>>
>>>>> There are many other SDRs out there. WinRadio, AirSpy and a boat
>>>>> load of other makes and models. HAS ANYONE ACHIEVED ANY MEASURE OF
>>>>> SUCCESS getting one of these smart boxes to provide a useful
>>>>> spectral display of arcing interference? If so, please share with
>>>>> this group!!!
>>>>>
>>>>> Thank you!
>>>>>
>>>>> Frank N. Haas KB4T
>>>>> Utility Interference Investigator
>>>>> Florida
>>>>> _______________________________________________
>>>>> RFI mailing list
>>>>> RFI@contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/rfi
>>>>>
>>>>
>>>>
>>>
>>
>>
>> --
>> Frank N. Haas KB4T
>> Utility Interference Investigator
>> Florida
>>
>>
>>
>
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